Vacuum pressure pump



Sept. 15, 1942.

B. R. HOPKINS 2,295,790

VACUUM PRESSURE PUMP Filed July 30, 1940 3 Sheets-Sheet l I I v Inventm Z9 flew/lie 190 10";

Attorneys Sept. 15, 1942. a. R. HOPKINS VACUUM PRESSURE PUMP- Filed July 50, 1940 3 Sheets-Sheet 2 1n ventor 58/1 1112 64 1 A fidmvys Sept. l5, 19 2- I B. R. HOPKINS VACUUM PRESSURE PUMP Filed Jui so, 1940 3 Sheet s 3 22 l 2% 111 a k z;

I nto:

Patented Sept. 15, 1942 UNITED STATES PATENT OFFICE VACUUM PRESSURE PUMr Bennie R. Hopkins, Flint, Mich. Application July so, 1940, Serial No. 348,517

Claims.

This invention relates to a vacuum pressure pump, the general object of the invention being to provide a cylinder having piston means therein equipped with valves with the parts so arranged that vacuum is produced in the cylinder at one stroke of the pump to draw into the cylinder fluid from a supply and this stroke forcing fluid previously drawn into the cylinder from another part of the cylinder, this fluid being transferred to a second part of the cylinder on the return stroke of the pump so that a charge of fluid is drawn into the cylinder on one stroke of the pump and then transferred to another part of the cylinder on the return stroke and then this fluid in said other part of the cylinder is forced from the cylinder on the next stroke of the pump.

Another object of the invention is to provide means whereby leakage of fluid by the piston means is returned to the cylinder and any leakage in the crankcase can be returned to the cylinder by manipulating a valve so that suction created by the pump will draw this fluid which has leaked into the crankcase therefrom.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure l is an elevational view of the improved pump as used with a refrigerating system.

Figure 2 is a section on the line 2--2 of Figure 1.

Figure 3 is a vertical sectional view through Figure 2.

Figure 4 is a sectional view through a valve means for taking care of leakage in the cylinder and crankcase.

Figure 5 is a view in section and in elevation of the fluid tank and the valve means located between the connection of the tank and the cylinder.

Figure 6 is a section on the line 6-6 of Figure 2.

In these views the numeral I indicates the crankcase of the engine and the numeral 2 indicates the cylinder which has its base 3 seated on the reduced top part of the crankcase and bolted thereto by the bolts 4, gaskets 5 being provided for forming a fluid-tight joint between the base and the crankcase. A

top I5 is bolted to the upper bolts end of the cylinder and a gasket 1 is located between the top and the cylinder and said top has a centrally arranged depending portion 8 which may be referred to asa stationary piston. A passage 9 extends through the central part of the top and through the member 8 and a ball-type of valve In rests upon a seat formed by the reduced part of the bore at the lower end of the member 8. The piston is shown at II and has a large bore I2 extending downwardly from its top to form a cylinder for the stationary piston 8 and an upwardly opening ball .valve I3 controls a passage I4 which passes from the bore I2 to the lower end of the piston II. The valve III also opens upwardly, The stationary piston 8 and the piston II are provided with rings I5. The piston rod is shown at I6 and has an offset upper end which is bolted to the lower end of the piston I I as shown at H and a plate I8 is located in the lower end of the cylinder 2 and is fastened therein by a bolt I9 and said plate has a recess 20 in a part thereof for receiving the offset portion of the piston rod when the piston I I is in lowered position. The rod passes through a hole in the base 3 and through the packing means 2I located in an enlarged under part of the hole and the lower end of the rod is threaded into a cross head 22 having a forked lower end receiving a connecting member 23, a pin 24 connecting this member 23 with the forked lower end of the cross head. This member 23 forms part of a ring 25 which engages an eccentric or crank 26 of the shaft 21, said shaft being rotatably supported in the crankcase by means of the anti-friction bearings 28 and one end of the shaft extends through a side wall of the crankcase where it receives a pulley 2| or other member which will permit the shaft to be driven from a source of power. A plate 30 covers the opening through which the shaft passes and is fastened in place by the bolts 3I and a packing plate 32 is forced against the plate 30 by the spring means 33 which also presses a member 34 having a bearing part against the flaring part 35 of the shaft, this arrangement preventing any oil in the crankcase from leaking therefrom around the shaft.

Guide. plates 36 extend vertically at opposite sides of the upper portion of the crankcase and engage slots in the cross head and each plate can be adjusted in a horizontal plane by a center bolt 31 passing through a horizontal slot 38 in the crankcase and each plate can also be adjusted toward the cross head by the upper and lower 39 passing through threaded holes in the crankcase and bearing against the outer edge of the plate.

A small tank whas its upper end in communication With a valve casing El and a tube 42 and a check valve 42' connects the outlet of the valve casing with the lower part of the cylinder 2, the pipe preferably communicating with the recess in the plate 18. A Valve member 43 which may be similar to that shown at 4| is in communication with the bore 9 in the top of the cylinder and a tube (not shown) is connected with the valve 53 and if the pump is used in a refrigerating system this pipe connected with the valve 33 would lead to parts of the system and thenthe fluid from the system would return to the tank through a tube 44.

On the up-stroke of the piston H fluid will be drawn from the tank 28 through the tube 42 and by the valve M into the lower part of the cylinder 2 and thenon the down-stroke of the cylinder l2 this fluid will be forced from the lower part of the cylinder by the valve l3 into the cylinder or bore I-Z of'the piston I l and on the next stroke this fluid will be forced into the bore 9 by the valve l0.

A tube 5 extends from a side of the cylinder 2 and is in communication with the lower part thereof and has an enlarged outer end 46 provided with a cap' i'l and a needle valve 48 has a threaded part 49 threaded in the part 46, this valve being adjusted by a wrench or the like engaged with the head 50' thereof after the cap 41 has been removed. A tube 5t connects the tube 45 with the upper end of the cylinder and a check valve 52 is arranged in the inner end; of the tube and closes outwardly. A second tube 53 connects the part 46 with the top part of the crankcase and communication between the tube 53.and the tube d5 is controlled by the needle valve 43.

Thus it will be seen that any fluid collecting in the top of the cylinder above the upper end of the piston H will be drawn through the tube 5! and the tube 55 by the valve 52 on the upstroke of the piston H or by pressure of the upward stroke of'the piston ,Ii on this fluid, and if fluid should leak by the piston rod into the crankcase in the form of gas or vapor this gas or vapor can.

be removed from the crankcase by opening the needle valve 49 so that the suction created by the piston it will draw the gas through the tube 53 by the open valve iii'and through the tube 55 into the lower part of the cylinder.

The packing means shown at H includes a cupshaped member 5 3, see Figure 6, placed in the enlarged part of the opening in the base 3 with a plurality ofpacking disks 55 in the cup-shaped member separated: by the washers 56 with a sprin 5? in the bottom of the cup-shaped member pressing the washers and rings upwardly against the top of the large part'of the opening.

As will be seen from Figure 1 some of. the rings contact the piston rod while others contact the cup-shaped member.

Further, as regards the operation, the cubic capacity of the cylinder 2 in the upstroke position of the piston H is approximately twice that of the bore l2 of said piston. The intake valve 42' is designed so that under the upstroke of the piston i i twice the volume of fluid is admitted to the cylinder 2 that can be accommodated in the bore i2. Hence, on both the downstroke and upstroke of the piston ll, fluid will be forced past valves l3 and i2 anda steady flow will pass to bore 9 under normal conditions of back pressure.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. A pump of the class described comprising a cylinder having a closed bottom, a piston provided for reciprocatory movement in the cylinder and having a centrally arranged cylinder forming bore therein opening through its top, and a passage connecting the lower end of the bore with the cylinder, an upwardly opening valve for controlling the passage, a top for th cylinder having a centrally arranged depending part forming a stationary piston extending into the cylinder forming bore of the piston, and the top and said stationary piston havin a bore passing therethrough, an upwardly opening valve controlling the communication between said bore and said passage and means for reciprocating the movable piston, means for connecting the lower end of the cylinder with a source of fluid supply and a discharge pipe connected with the upper end of the bore in the top of the cylinder.

2. Apump of the class described comprising a cylinder, a piston provided for reciprocatory movement in the cylinder and having a centrally arranged cylinder forming bore therein opening through its top, and a passage connecting the lower end of the bore with the lower endof the piston, an upwardly opening valve for controlling the passage, a top for the cylinder having acentrally arranged depending part forming a stationary piston extending into the cylinder forming bore of the piston, and the top and said stationary piston having a bore passing therethrough, an upwardly opening valve controlling the communication between said bore and said passage and means for reciprocating the movable piston, means for connecting the lower end of the cylinder with a source of fluid supply and a discharge pipe connected with the upper end of the bore in the top of the'cylinder, a tube connecting the top of the chamber in the cylinder above the piston with the-lower part of the chamber below the piston and said tube having an outwardly closing check valveconnected with the lower part of the chamber.

3. A pump of the class described comprising-a cylinder, a piston provided for reciprocatory movement in the cylinder and having a centrally arranged cylinder forming bore therein opening through its top, and a passage connecting the lower end of the piston, an upwardly opening valve for controlling the passage, a top for the cylinder having a centrally arranged depending part forming a-stationary piston extending into the cylinder forming bore of 'the piston; and the top-and said-stationary piston having'a bore passing therethroughyan upwardly opening valve controlling the communication between said bore and said passage and means for reciprocating the movable piston, meansfor. connecting the lower end of the cylinder. with a source of fluid, supply and a .discharge pipe connected, with the upperend of, the bore inthe top or the cylinder, a tube, connecting the top of thechamberin the cylinder, With the lower part ofthe chamber and said tube having an outwardly closing check valve therein, a cranktherein in that end which is bore with the lower end of the caseconnected with the lower end of the cylinder, a shaft passing through the crankcase, a piston rod connected with the movable piston and extending into the crankcase, means for reciprocating the rod from the shaft and a tube connecting the top of the crankcase with the tube leading into the lower part of the chamber and a manually operated valve for controlling communication between the two tubes.

4. A pump of the class described comprising a cylinder, a piston provided for reciprocatory movement in the cylinder and having a centrally arranged cylinder forming bore therein opening through its top, and a passage connecting the lower end of the bore with the lower end of the piston, an upwardly opening valve for controlling the passage, a top for the cylinder having a centrally arranged depending part forming a stationary piston extending into the cylinder forming bore of the piston, and the top of said stationary piston having a bore passing therethrough, an upwardly opening valve controlling the communication between said bore and said passage and means for reciprocating the movable piston, means for connecting the lower end of the cylinder with a source of fluid supply and a discharge pipe connected with the upper end of the bore in the top of the cylinder, said piston rod having an offset upper end connected with the piston for causing the upper end of the piston rod to clear the lower end of the passage in the movable piston and the lower end of the cylinder having a recess therein for receiving the offset part of the piston rod when the piston is in lowered position.

5. A pump of the class described comprising a cylinder having a closed bottom, a piston provided for reciprocatory movement in the cylinder and having a centrally arranged cylinder forming bore therein opening through its top, and a passage connecting the lower end of the bore with 1e cylinder, an upwardly opening valve for controlling the passage, a top for the cylinder having a centrally arranged depending part forming a stationary piston extending into the cylinder forming bore of the piston, and the top and said stationary piston having a bore passing therethrough, an upwardly opening valve controlling communication between said bore and said passage, means for reciprocating the movable piston, means for connecting the lower end of the cylinder with a source of fluid supply, and a relief pipe open to the upper end of the cylinder and leading to the lower end of the same.

BENNIE R. HOPKINS. 

